The combined effects of humidity and temperature can pose serious health risks.
| Heat Index | Danger Level | Symptoms |
|---|---|---|
| Above 130 | Life threatening | Heatstroke possible with only brief activity |
| 105 - 130 | Extreme danger | Heat cramps, exhaustion, headaches after brief activity |
| 90 - 105 | Danger | Heat cramps, exhaustion, headaches after prolonged activity |
| 80 - 90 | Caution | Exercise causes fatigue more rapidly |
Information from NOAA
Credits: Javascript by Pat Barling from a Perl script by Tim Brice of the National Weather Service, El Paso.